Legal Sea Foods’ newest glossy, modern Legal C Bar will open at the Derby Street Shoppes in late May.

It will be the third Legal C Bar location for the Boston-based restaurant chain. The others are at Legacy Place in Dedham and Logan International Airport in Boston.

Renovations began in mid-March when Legal Sea Foods took over the space formerly occupied by Jasper White’s Summer Shack.

“They modeled themselves as being family-friendly, which is fine,” Legal Sea Foods CEO Roger Berkowitz said. “This particular location that we’re doing, certainly families are invited, but it really speaks to a little bit more of a sophisticated crowd: date night, couples and singles.”

The Legal C bar concept – which debuted at Legacy Place in 2010 – has an informal, urban feel with a “bar-centric” layout and open floor plan. Glass and steel fixtures create an industrial atmosphere. The menu emphasizes appetizers and tapas-style offerings.

The 6,500-square-foot restaurant will seat 195 patrons.

Legal Sea Foods also will open one of its traditional-format restaurants in late summer at the new Hyatt Place shopping center in Braintree. Its existing 200-seat restaurant at South Shore Plaza, which has been open since 1995, will close in December.

Berkowitz said he chose the new location because of a business relationship with Cambridge-based developer Carpenter & Co., its landlord at Charles Square in Cambridge.

“It was an opportunity to create a new space from the bottom up,” Berkowitz said. “The visibility from the highway will be great, and you’ll be able to see our signage from Route (93).”

The 8,200-square-foot restaurant will seat nearly 275 patrons, including private dining rooms and a patio.

Legal Sea Foods operates more than 30 restaurants on the East Coast. A fourth Legal C Bar is to open early next year at Assembly Square in Somerville.